Spring stand for dobby looms



Nov, 2, 1937.

E. R. HOLMES SPRING STAND FOR DOBBY LOOMS Filed June 2; 1936 Inventor EWridqe R Ho\me.-a

Attorney 2 Sheets-Sheet l Patented Nov. 2, 1937 Z,tt'i,665

SPRING STAND FOR DOBBY LooMs Elbridge R. Holmes, Worcester, Mass.,- assignor to Crompton & Knowles Loom Works, Worcester, Mass, a corporation of Massachusetts Application June 2,

3 Claims.

This invention relates to improvements in spring stands for dobby. looms and it is the general object of the invention to provide a construction wherein the connection between the' springs and the'hooks which hold them will have a minimum of. wear when the harness frames are raised to their highest position.

In, dobby looms it is customary to raise the harness frames by a positive motion and to lower them by spring action. Spring stands have been provided heretofore wherein the. angular motion of, the. levers to which theharness frames and springs are connected serve to maintain a more or less. uniform strain on the harness frames. The links interposed between the lever and the spring, however,. have been so constructed that they are likely to rub against a part of the lever, such as its hub, when: the harnesses-approach their highest position and. partake of the angular motion of the lever, thereby causing a relative movement between. the link and the spring ends to cause wear. of the. latter. It. is an important object of my present invention to'provide. a hook for the spring ends pivoted to the link so that as the harness frames. approach their highest position with. the in. engagement with the levers the pivoted hook may remain horizontal without disturbing materially the setting of the looped. end. of the springaround the hook.

It is a further object of my present invention to provide an improved form of loop constructed preferably of two pieces of similar pressed steel sections which have bearing areas struck therefrom to fit into the bores of the hooks and notches in the levers, after which the sections are secured together, as by riveting.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth.

In the accompanying drawings, wherein a convenient embodiment of my invention is set forth,

Fig. 1 is a front elevation of a portion of a loom having my invention applied thereto,

Fig. 2 is an end elevation of the spring stand, parts being in section,

Fig. 3 is an enlarged front elevation of the spring stand,

Fig. 4 is a through one of the and Figs. 5, 6 and. 7 are diagrammatic views showing successive positions of the spring hook, link lever and connector for one harness frame as the latter is raised.

transverse longitudinal section links and associated hook,

1936, Serial N0. 833089 Referring to the drawings, the loom frame l0 supports arches ll having a generally at I 2 to operate the harness frames l3.

dobby designated The latter are raised by cords I4 passing over sheaves I5 and connected to the dobby jacks l6. 5

Depressing connectors l8 depend from the under side of the harness frames and are the means by which the harness frames are caused to move downwhen subjected larly during the latter of the harness frames.

to spring action, particupart of the down motion The matter thus far describedis of common construction and of itself forms no part of my invention.

The mechanism for pulling the harness frames down comprises a spring stand 29 having uprights 2i at each of. the four corners thereof held adjustablyin feet 2 2 secured to the floor.

Bolts 23 extending through slots M in the feet permit vertical adjustments of the uprights so that the stand can be located at different heights from the floor. A longitudinally extending side bar 25 on each side of the stand connects the adjacent uprights together; and a pivot rod 21 is provided near each upper end of the stand. This rod extendsbetween the uprights and may be held in position by screws 28 which pass through the uprights, as. indicated in section in Fig. 2. This construction allows the rods 2"! to be placed after the. uprights and side bars are secured together.

On each pivot rod Z'l' is a series of levers 30,

each lever being provided with a bore 3| through which the corresponding rod extends and each lever is further provided with a lower hook 32 to receive the bottom of a link l1 extending from the harness connector l8. Each lever is also formed with an upper two similar sections is struck an inwardly 31. When assembling,

hook 33 to receive a link 4, the link is formed of extending bearing tube the sections are placed together with one pair of tubes 31 inserted into the bore 38 of a hook 39, and rivets l 9 are then passed through the tubes and headed over to hold the sections securely together, as indicated in Fig. 4.

Each hook has ears 40 and M wardly and depending respectively, to receive tension springs 43.

diagrammatically frames which are near extending updownwardly therefrom, the looped ends 42 of frames and in doing to the elevated harthe position shown Those harness the front of the loom will act in the usual will have a less motion than those behind them and the rearmost frames may have a motion suficient to cause the links corresponding thereto to pass through the position shown in Fig. 6, which suffices for the front harness frame, to the position shown in Fig. 7. When in the latter position the links will bear against the hubs 45 of their associated levers and will thereafter swing around the rod 21 as a pivot; The hooks will thereupon swing around their pivots defined by the abutting tubes 31 adjacent thereto to maintain a substantially horizontal position, the springs tending to hold the hooks in the balanced position shown in Fig. 7.

By reason of the pivotal connection between the links 34 and the hooks 39 the latter will be able to maintain substantially the same relation which they bear to the springs when the lever moves from the position shown in Fig. 6 to that indicated in Fig, 7, thereby avoiding wear between the looped ends of the springs and the hooks. It is to be understood that in the course of loom operation the harness frames are required to reciprocate thousands of times and the elimination of wear between the hooks and the springs prolongs the life of both of these parts.

From the foregoing it will be seen that I have provided a simple connection between the springs and their lifting levers so constructed as to reduce greatly if not entirely eliminate Wear between the springs and hooks. This result is accomplished by pivoting the hooks to their respective links, thereby permitting the maintenance of the normal connections between the hooks and springs as the levers for the harnesses assume the position indicated in Fig. '7. It will be seen further that the link 34 is made of two similar parts each having a bearing for the hook and receiving the rivet l9.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not Wish to be limited to the details herein disclosed, but what I claim is:

1. In a loom having a harness frame, a connector depending therefrom, a pivotal support, a lever on the pivotal support normally extending downwardly therefrom, a link having two spaced sections lying on opposite sides of the lever and the lever but without angular motion relatively to the lever, hook moving thereby stretching the spring, the pivotally with respect to the link and maintaining normal position relatively to the spring, the sections aligning the lever and hook I and engaging the lever at points spaced in the direction of the axis of the lever.

V 2. In a loom having a harness frame, a lever connected to the harness frame and having a notch, a spring for the lever, two similar spaced pressed metal sections lying on opposite sides of the lever, each section having adjacent each end thereof an integral tube struck therefrom, rivets passing through corresponding tubes to secure the sections together, and a hook between the sections pivoted on the aligned tubes at one end of the link and attached to the spring, the aligned tubes at the other end of the link being adapted for reception of the notch in the lever, the spaced sections aligning '1' the lever and hook lying therebetween.

, 3. In a loom having a harness frame, a'lever connected to the harness frame, a spring for the lever and a link, said lever having a notch, the link being formed of two sections having fiat extended body portions lying on opposite sides of the lever, a tube struck from a point adjacent each end of each section and projecting laterally from the body portion, rivets extending through aligning tubes to secure said sections together with the body portions spaced to receive the lever, the aligned tubes at one end of the link being adapted to enter the notch of the lever, and a hook disposed between the body portions of the sections and surrounding the aligned tubes at the other end of the link and attached to the spring, the spaced sections aligning the lever and hook lying therebetween.

ELBRIDGE R. HOLMES.

a link formed of 

